: The radio uses a DW01A (IC2) and an 82015A MOSFET (IC1) for overcharge protection, while a TP4056 (U2) manages the 400mA charging for the 18650 Li-ion battery.
For a detailed look at the PCB and component placement, you can view the Gary DeBock teardown on SWLing Post or the official XHDATA website for the latest user manuals. Are you looking to repair a specific issue like a charging failure or are you planning an antenna modification xhdata d-808 schematic